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FREE ONLINE TOOL

Stamp & Scan Tool

Choose your own PNG seal and stamp images or PDFs page by page: drag to position, scroll to resize, batch-apply to all pages, and export a rasterized PDF. Everything runs locally in your browser — your files and seal never touch a server. No sign-up, open and go.

The tool runs in the panel above. Note: the tool interface is in Chinese — the operations are: open a file → stamp → export.

Features

🔒 Files never upload

Everything is processed locally in your browser. Contracts, quotes and your seal image never touch a server — safe for sensitive documents.

📎 Scan-only mode

No stamping — turn an electronic PDF into a scanned-document look (brightness/yellowing/per-page offsets) and export a rasterized PDF.

📄 Images and PDFs

Stamp an image and copy or save it as PNG; stamp a PDF page by page with batch alignment, and export a rasterized, tamper-proof file.

🪧 Your own PNG seal

Choose a transparent PNG as your seal. It is stored in your browser, so the next visit needs no re-upload.

How to use

  1. 1. Choose your seal: click "Choose seal (PNG)" in the top-right and load your seal image (transparent PNG works best).
  2. 2. Open a file: drop an image or PDF into the tool, or click "Open image / PDF".
  3. 3. Stamp: drag the seal into place, scroll to resize, adjust opacity with the slider; for PDFs, tick "Batch adjust" to align every page at once.
  4. 4. Export: images are copied or saved as PNG; PDFs export as a rasterized, tamper-proof file.

FAQ

Will my contract or seal be uploaded?

No. The tool is built on browser-local technology — everything happens on your device, and it works offline too.

What seal format is supported?

PNG images (transparent background recommended). The seal is stored in your browser’s local storage, so it is remembered on the same computer and browser; clearing browser data removes it.

What is this tool for, and why is it free?

It was built for our own quoting and contract workflow, and opened up for procurement and sales folks with the same need. Cremage is a precision acrylic and engineering plastics machining factory in Wuxi, China (see what we make).

About the developer

Wuxi Cremage Technology Co., Ltd is a source factory for precision acrylic and engineering plastics: equipment guards, precision sight windows, machined plastic parts, injection molding and tooling — machining accuracy ±0.01 mm, flatness within 0.05 mm. This stamping tool is a small piece of internal software we opened up for everyone. Visit the Cremage website or contact us for acrylic and engineering plastics machining.

Disclaimer: this tool provides image processing only. You are responsible for the authenticity and legality of stamped content, must hold the legal right to any seal you use, and must not use it for forgery or any unlawful purpose. The developer assumes no liability for stamped output.